field

问题 I'm working through the book Head First C# (and it's going well so far), but I'm having a lot of trouble wrapping my head around the syntax involved with using the "this." keyword. Conceptually, I get that I'm supposed to use it to avoid having a parameter mask a field of the same name, but I'm having trouble actually tracking it through their examples (also, they don't seem to have a section dedicated to that particular keyword, they just explain it and start using it in their examples).

问题 I am having a bit of trouble with ADO. I have deployed a database application, which uses Access. With the release of different versions database tables have different fields, some added others deleted etc. What I can't get to work is how to add a BOOLEAN field in the database. For upgrade purposes I use the standart sql query component with a sql that looks like this : ALTER TABLE XXX ADD COLUMN YY BOOLEAN while this works for other data types, such as VARCHAR, INTEGER, DOUBLE etc, it does

问题 I would like to ask whether there is any field, like the one attached below, available in Django as a single object. If no, then how can we generate such a functionality of moving selected items to the right hand side. Please guide, I shall be extremly thankful. 回答1: You could make use of Django's FilteredSelectMultiple widget, as seen in the django-admin when you use filter_horizontal on a ManyToManyField : Here's an example of doing it yourself with your own form: http://djangosnippets.org

问题 Something I have been trying to do and still can't get done. Reading the information typed in a website input field and being able to copy that. Is there a way I can read the ty 回答1: try these articles about using TWebBrowser and delphi to read data from a web page. How to read and write form elements TWebBrowser OleObject and Document data 回答2: Javascript document.getElementById('input-field-id').value returns the contents of an input box. What are you trying to do? 来源： https://stackoverflow

问题 I've added department approvals to the standard CMMI-Template Requirement work-item. I'd like to limit the System.State field such that it can only be changed from Proposed to Active when all department approvals are set to "Yes". I've tried the following change to Requirement.xml <FIELD name="State" refname="System.State" type="String" reportable="dimension"> <WHEN field="Approval.Marketing" value="No"> <READONLY /> </WHEN> <WHEN field="Approval.Quality" value="No"> <READONLY /> </WHEN>

问题 I'm new to Java and I saw a Q&A section here with two examples where mutability is removed. Upon testing MutableString.java: import java.lang.reflect.Field; public class MutableString { public static void main(String[] args) { String s = "Immutable"; String t = "Notreally"; mutate(s, t); StdOut.println(t); // strings are interned so this doesn't even print "Immutable" (!) StdOut.println("Immutable"); } // change the first min(|s|, |t|) characters of s to t public static void mutate(String s,

问题 I have a TFS Question regarding the Description field. Currently the TFS Description field is an empty field in which users add any info. Is it possible to embed some type of text? Example: When creating a new bug, TFS Description field is empty. Instead I want to have the following populated within the description field. Configuration and Logs Version and Environment Reproduction Steps Device/Environment Screenshots or related files (certificates, etc.) are attached I assume it would be

问题 I saw someone not set the length in a tutorial but it was specifically for counting the total number of users and just set to auto-increment. I've been of the habit of always specifying a length because I thought it was mandatory, but I wanted to ask if I can leave it blank unless it specifically a date or pin number etc where the length is always set. (I used to set it as 11 digits or more if I wasn't sure) 回答1: Every integer field defaults to 11 when left blank so you can leave it. 回答2: No,

问题 I saw someone not set the length in a tutorial but it was specifically for counting the total number of users and just set to auto-increment. I've been of the habit of always specifying a length because I thought it was mandatory, but I wanted to ask if I can leave it blank unless it specifically a date or pin number etc where the length is always set. (I used to set it as 11 digits or more if I wasn't sure) 回答1: Every integer field defaults to 11 when left blank so you can leave it. 回答2: No,

问题 I'm looking for way to get something like this: string _col1 = "first name"; string _name; var query = from c in ctx.Customers select c; _name = query.FirstOrDefault().[_name]; As far as I can see I can only get strongly typed field names but I would like to provide them as string variables. 回答1: I'm not sure if EF provides you with a way to get a property value based on the string name of the property, but you can use reflection. string name = typeof(Customer) .GetProperty("first name")